Methods for post-mold processing a Venturi device or check valve
Methods for post-mold processing a Venturi device for generating vacuum are disclosed that improve the evacuation time thereof. The methods include providing a molded Venturi device having a body defining a Venturi gap between an outlet end of a converging motive passageway and an inlet end of a diverging discharge passageway, where the outlet end defines a motive exit having flash extending radially inward and the inlet end defines a discharge inlet having flash extending radially inward. Then, the method includes positioning the molded Venturi device with an inlet end of the converging motive passageway facing a blasting nozzle or with an outlet end of a diverging discharge passageway facing a blasting nozzle, and propelling blasting media into the motive inlet or the discharge exit of the Venturi device to remove the flash in the motive exit and in the discharge inlet, or vice versa.
1. A method for post-mold processing a Venturi device, the method comprising:
providing a molded Venturi device having a body defining a Venturi gap between an outlet end of a converging motive passageway and an inlet end of a diverging discharge passageway, the outlet end defining a motive exit having flash extending radially inward and the inlet end defining a discharge inlet having flash extending radially inward;
positioning the molded Venturi device with an inlet end of the converging motive passageway facing a blasting nozzle; and
propelling blasting media into a motive inlet of the Venturi device for six to eight seconds to remove the flash in the motive exit and in the discharge inlet and modify the interior surface of the discharge inlet to form a corner radius in a range of 0.05 mm to 1 mm.
2. The method of claim 1 , wherein the motive inlet is circularly shaped and the motive exit is elliptically shaped.
3. The method of claim 2 , further comprising rotating the Venturi device about a central longitudinal axis that runs through the motive inlet, the motive exit, the Venturi gap, and the discharge inlet during the propelling of the blasting media.
4. The method of claim 1 , wherein the blasting nozzle is part of a continuous feed blasting system, and positioning the Venturi device comprises placing the motive inlet a pre-selected distance apart from the blasting nozzle, wherein substantially all the blasting media is received within the converging motive passageway.
5. The method of claim 4 , wherein the continuous feed blasting system comprises a reservoir of blasting media and a dust collector for particles less than 150 grit.
6. The method of claim 1 , wherein the blasting nozzle defines a nozzle exit having a diverging cone, diverging toward the Venturi device.
7. The method of claim 1 , wherein the blasting nozzle is part of a closed feed media blasting system, and positioning includes inserting a nozzle exit of the blasting nozzle within the motive inlet of the Venturi device.
8. The method of claim 1 , further comprising positioning a secondary blasting nozzle facing a suction port of the body, and propelling blasting media into the Venturi device through the suction port.
9. The method of claim 8 , wherein propelling blasting media occurs first through the motive inlet and subsequent thereto through the suction port.
10. The method of claim 8 , wherein propelling blasting media occurs simultaneously through the motive inlet and the suction port.
11. The method of claim 1 , wherein the blasting media comprises a metal oxide.
12. The method of claim 11 , wherein the metal oxide is aluminum oxide.
13. The method of claim 1 , wherein the blasting media comprises one or more of glass, metal, ceramic, polymer, plant matter, ice, or solid carbon dioxide.
14. The method of claim 1 , wherein the corner radius is in a range of 0.1 mm to 0.35 mm.
15. The method of claim 1 , wherein the corner radius has a plurality of regions of curvature that together form the entire corner radius, wherein a first region is positioned most proximate the opening defining the discharge inlet and a second region is positioned further inward relative to the central longitudinal axis A into the diverging discharge passageway, and a first length of the first region is smaller than a second length of the second region and the radius of curvature of the first region is greater than the radius of curvature for the second region.
16. The method of claim 1 , wherein propelling the blasting media comprises 150 grit or less than 150 grit blasting media at a pressure of 63 psi.
17. The method of claim 16 , wherein propelling the blasting media comprises a nozzle having a 0.75 inch outer diameter.
18. A method for post-mold processing a Venturi device, the method comprising:
providing a molded Venturi device having a body defining a Venturi gap between an outlet end of a converging motive passageway and an inlet end of a diverging discharge passageway, the outlet end defining a motive exit having a flash extending radially inward and the inlet end defining a discharge inlet having a flash extending radially inward;
positioning the molded Venturi device with an outlet end of the diverging discharge passageway facing a blasting nozzle;
propelling the blasting media into a motive inlet defined by the converging motive passageway for six to eight seconds at a rate of media flow that removes the flash from the discharge inlet and the motive exit, and modifies the interior surface of the discharge inlet to form a corner radius in a range of 0.05 mm to 1 mm; and
propelling blasting media into a discharge exit defined by the outlet end of the diverging discharge passageway to remove the flash in the discharge inlet and in the motive exit;
wherein propelling the blasting media into the discharge exit is before or after propelling the blasting media into the motive inlet.